______ is often used to refer to the US Department of Defense.A．The Capitol HillB．The Whit

Copper is often used as an electrical conductor because it _____.

One way for the region to use water efficiently is to ______.A．develop other enterprises t

Grammatical context refers to ______ in which a word is used.A．vocabularyB．grammarC．semant

Cylinder liner cooling is often referred to as _____.A.piston coolingB.sleeve coolingC.cen

The term "British disease" is now often used to characterize Britains ______ decline.A．pol

"The big apple" is often used to describe______.A．WashingtonB．New York CityC．DetroitD．Hous